112.txt

来自「介绍VB里的各种控件的使用方法,窗口控制,图像编程以及OCX等内容,还提供了一个」· 文本 代码 · 共 74 行

用MDB文件做密码库


能用数据库做密码库吗？ 
这是我曾经编过的一段程序,从MDB数据库中提取regpass表中的内容,用一个datacombo控件列出常的用户名供选择,一个TEXTBOX供用户输入密码,大概思路如此,希望对你有帮助.
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Dim cnnPass As New ADODB.Connection
Dim rstPass As New ADODB.Recordset
Dim strSQL As String
Dim LoginSucceeded As Boolean
Private Sub cmdCancel_Click()
LoginSucceeded = False
Unload Me
End Sub
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Private Sub cmdOK_Click()
LSize = Len(CombUserName.Text)
If LSize 0 Then
User = Left$(CombUserName.Text, LSize)
Else
User = vbNullString
End If
If User = "管理员" Then
Pass = rstPass!Password
If txtPassword.Text = Pass Then
LoginSucceeded = True
Else
MsgBox "无效的密码，请重试!", vbExclamation + vbOKOnly, "登录"
txtPassword.SetFocus
SendKeys "{Home}+{End}"
End If
ElseIf User = "普通用户" Then
User = "普通用户"
LoginSucceeded = True
'在此加入一些限制代码
Unload Me
Else
MsgBox "非法用户!!!", , "登录"
CombUserName.SetFocus
txtPassword.SelLength = Len(txtPassword.Text)
SendKeys "{Home}+{End}"
End If
End Sub
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Private Sub Form_Load()
DatName = App.Path & "\DBNAME.dll"
cnnPass.Provider = "microsoft.jet.oledb.3.51"
cnnPass.Open DatName, "admin"
strSQL = "select * from regpass "
rstPass.CursorLocation = adUseServer
rstPass.Open strSQL, cnnPass, adOpenKeyset, adLockReadOnly, adCmdText
With CombUserName
Set .DataSource = rstPass
.DataField = "UserName"
Set .RowSource = rstPass
.ListField = "UserName"
.BoundColumn = "UserName"
End With
CombUserName.Text = "管理员"
End Sub

Private Sub Form_Unload(Cancel As Integer)
If rstPass.State = adStateOpen Then
rstPass.Close
Set rstPass = Nothing
End If
If cnnPass.State = adStateOpen Then
cnnPass.Close
Set cnnPass = Nothing
End If

End Sub